(CNN) - With Tuesday's contests in Washington State, Wisconsin, and Hawaii behind them, the presidential candidates are now focussing their attention on the upcoming contests in Ohio and Texas on March 4.

In Wednesday's highlights, watch Sens. Barack Obama, John McCain, and Hillary Clinton out on the trail and watch Mike Huckabee discuss why he's remaining in the hunt for the GOP's nomination.

Related: Listen to Candy Crowley discuss the race for the Democratic nomination